Keystones — Lintel
Five GCSE retrieval questions · 20 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 70,000,000 in standard form
Answer: 7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 24.28cm -
4. Ratio Mixed ratio problems
£350.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £200.00 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 39, 24, 22, what is the missing number?
Answer: 23